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Re:Ask HN: Calendar/event manager that doesn't suck? by daltonlp on Saturday August 13, 2016 @09:57PM (#12283979)
Here's a possibility:

http://www.teamup.com/

Re:Ask HN: Calendar/event manager that doesn't suck? by MTemer on Sunday August 14, 2016 @01:00PM (#12286311)
No e-mail notifications for the participants, unfortunately.